i`ve had my 2000 gs400 for 3 years now, and my locks just stopped working. The weird thing is they work when they feel like it...? When i push the lock button (on the key or in the car all the doors except the drivers dont lock. They make a weird buzzing noise, and they look like they want to lock because they move a little bit but thats about it. what could be wrong? and how do i fix it? id appreciate some help. thanks! :D